The depth of the river is maintained by dredging.

通过疏浚保持河道的深度。

《新英汉大辞典》

What was truly despicable was the deafening silence maintained by the candidates concerning the riots.

真正可鄙的是这些侯选人对暴乱所持的缄默态度。

《柯林斯英汉双解大词典》

Sodium-potassium balance is maintained by the sodium potassium pump.

钠钾泵维持钠钾平衡。

youdao

He says UMNO maintained power for years by giving special treatment to its core constituency - ethnic Muslim Malays, who make up 60 percent of the population.

VOA: standard.2010.02.24

Because it was precisely because of this one world, run by the Romans and maintained by the Romans, that allowed the spread of Christianity, to a great extent, both ideologically and thought-wise, as well as simply physically.

因为正是由罗马人统治维持的，这个统一的世界，给予基督教在大范围面积内广为传播的机会，不仅是在意识形态和智慧方面，还有物质条件方面。

耶鲁公开课 - 新约课程节选

The Romans maintained peace, for one thing, by leaving local populations pretty much alone when it came to local customs, religions, and living arrangements.

首先，为了维护和平，罗马人没有过多干涉当地居民,对于当地风俗，宗教，居住安排，给予极大自由。

耶鲁公开课 - 新约课程节选

Next, it will use a database of genes maintained by Incyte Pharmaceuticals, in Palo Alto, Calif.

FORBES: A hail of silver bullets

The dock is currently maintained by the Northern Ireland Science Park in Belfast's Titanic Quarter.

BBC: Titanic dock gets ?1.5m funding boost

But other phenomena that look like diseases are known to be maintained by natural selection.

ECONOMIST: Psychopathy